Depends what you mean by "ideas".
In modern society, it's usually wireless communication such as internet.
Trade.
Alexander the Great bulit an empire to help spread greek ideas. Have fun.
Social media can help spread information and awareness about political revolutions.
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the Salons during the Enlightenment period, helped spread elightened ideas.
Philanthropy can be spread around the world by monetary giving of individuals to support a cause. Funding is of utmost importance in getting things done in all the different charities that are wanting to help the world.
Monks help spread Christianity across Europe.
Important ideas may begin in the midst of a big problem that needs sorted. These ideas then spread out with help from others who are willing to put the plan into action.
literature help us understand the world by allowing us to be open to new ideas
literature help us understand the world by allowing us to be open to new ideas
passing on their opinions when they travelled
Paper Money was first created by the Chinese around 600 AD. When the Mongols invaded, it was still there. So, Mongol traders spread it around the world while trading themselves. Hope it was a help!
The invention of the printing press made it less expensive and less time consuming to produce books. The availability of books allowed ideas to spread quickly.